Each block is stacked on top of the previous one. Adding another block to the top makes all lower blocks more difficult to remove: there is more "weight" above each block. A transaction in a block 6 blocks deep (6 confirmations) will be very difficult to remove.

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i am sorry for this op but my new wallet is currepted forone of my silly mistake and now i have again made anew wallet and had taken nessaciry backups pleasechange my address13F4G4mSe2qGxvo9AwE6bQLVrxBBg6snvm